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April 18, 2014

Search: What mass of CaCl2 is needed to prepare 3.65 L of a 1.75M solution

Number of results: 74,248

chem
How many grams of CaCl2 (molar mass = 111.0 g/mol) are needed to prepare 4.44 L of 0.500 M CaCl2 solution?
Sunday, May 15, 2011 at 7:47pm by jann

Chemistry
You need to re-read the problem and see how impossible it is; however, I think I know what you are asking. You want a 15% solution of CaCl2 but you must use CaCl2.2H2O to make the solution. If that's what you're asking, do it this way. And I'm assuming that is 15 mass percent...
Friday, May 17, 2013 at 4:32pm by DrBob222

chemistry
calculate the value of water that is needed to dissolve 1.11 g of CaCl2 in order to prepare a 0.0250 M CaCl2 solution?
Tuesday, July 15, 2008 at 8:26pm by shanta

Chem
2.00 M = 2.00 mols/Liter of solution. Convert 2.00 M to grams CaCl2 in the solution. 1 L of the solution has a mass of 1.17 x 1000. That is the mass of the water + the mass of the CaCl2. Subtract mass CaCl2 to obtain mass H2O. Now you have the mass and # mols CaCl2 and the ...
Friday, April 25, 2008 at 9:46pm by DrBob222

Chemistry
1.72% w/v means 1.72 g CaCl2 in 100 mL of solution so that would be 10x that for 1 L of solution or 17.2 g CaCl2. The answer to the problem, therefore, is 17.2 g CaCl2 but it makes a difference how the solution is prepared. You can NOT add 17.2 g CaCl2 to a liter (1000 mL) of ...
Wednesday, April 27, 2011 at 5:29pm by DrBob222

chemistry
How do you sole this problem: how many grams of CaCl2 are needed to prepare 7.25 L of .015M solution?
Friday, March 15, 2013 at 1:30pm by Brittany jones

Chemistry
Can someone please check my work? Calculate the mass of (NH4)2S2O8 needed to prepare 250mL of a 0.100M solution. I got 5.705 g. Calculate the volume of 2.00M KI needed to prepare 250mL of a 0.200M solution. I got 0.025L or 25mL. Calculate the volume of 0.100M Na2S2O3 needed to...
Saturday, January 22, 2011 at 1:55pm by Rachel

Chemistry/maths
Using the following stock solutions: NaCl, 100mmol KCl, 200mmol CaCl2, 160mmol Glucose, 5mmol Calculate the volumes of each stock solution and the volume of water needed to prepare 100ml of a single solution containing NaCl at 5.0mmol KCl at 2.5mmol CaCl2 at 40mmol Glucose at ...
Thursday, October 22, 2009 at 8:35am by jess

Chemistry
Urgent... Someone please help!! Can someone please check to see if I am doing these correctly, I have a test tomorrow... Thank you :) Q) Calculate the new molarity of a 35mL sample of 0.450 M CaCl2 solution that is diluted with enough water to make 250 mL of solution. A) 0.450...
Tuesday, April 2, 2013 at 8:19pm by Kishwa

Chemistry
If you were to prepare a 1.00 molal solution of CaCl2 beginning with water at 27.0 C, what would the final temperature of the solution be (in C)? Assume that the specific heats of both pure H2O and the solution are the same, 4.18 J/K*g. The dissolution of CaCl2 in water is ...
Monday, April 18, 2011 at 4:20pm by Bob

chem
How many grams of CaCl2 would be required to be added to water to prepare 1 Liter (1000ml) of a 1.72% (w/v) aqueous solution of CaCl2?
Monday, April 25, 2011 at 10:50pm by ALEX9

Chemistry
how many grams of CaCl2 would be required to be added to water to prepare 1 liter (1000 ml) of a 1.72% (w/v) aqueous solution of CaCl2?
Wednesday, April 27, 2011 at 5:29pm by Tia

Please HELP CHEM
How many grams of CaCl2 would be required to be added to water to prepare 1liter (1000ml) of a 1.72% (w/v) aqueous solution of CaCl2?
Thursday, April 28, 2011 at 1:37pm by Tina

chemistry
Calculate the solubility of Cacl2 in g/L based on the experiement. Given 650g of CaCl2 added to 1.0L and allowed to dissolve as much as possible. While the remaining solid CaCl2 is filtered out of the solution and found to have a mass of 5.509g. What is the solublity of CaCl2
Wednesday, June 6, 2012 at 8:02pm by Greg

Chemistry HELP!!!
Only one question, it would be greatly appreciated if you would help me Thanx In an experiment, Na2CO3(aq) was added to 25.0 mL of CaCl2(aq) solution until no more precipitate was formed. The mass of precipitate produced was 2.50 g. Some statements about the experiment follows...
Thursday, September 28, 2006 at 1:24pm by Brittany Rusk

chemistry
1.30 M = 1.30mols of solute/L of solvent mass of Cacl2 = 1.30 mols CaCl2 x 111g/mol CaCl2(molar mass)= 144.3g of CaCl2 (solute) Solution = 1.11g/ml mass of solution = 1.11g/ml x 1000ml/L x1L = 1110g (solution) mass of solvent = 1110g (solution) - 144.3g (solute)= 965.7g of ...
Tuesday, June 16, 2009 at 4:56pm by ms

chemistry
If 2.1 moles of CaCl2 are dissolved in enough water to make a 0.92-liter solution, what is the resulting molarity? 0.44 M CaCl2 0.70 M CaCl2 2.3 M CaCl2 3.0 M CaCl2
Sunday, November 7, 2010 at 7:31pm by smith

chemistry
You wish to prepare a 10% CaCl2 solution. Only CaCl2 * 10H2O is availalbe. How many grams of the hydrated compound are required for 250ml of the reagent? Ca=40 Cl=35.5
Sunday, September 5, 2010 at 11:00pm by j

Chemistry
If the molality of a CaCl2 solution is .100 mol/kg, and was made from 500.0 mL of water, how many grams of CaCl2 were needed to make the solution? Step by step would be appreciated!
Thursday, March 14, 2013 at 6:48pm by Tim

chemistry
What mass (in grams) of CaCl2(s) must be dissolved in pure water at 10.0 deg Celsius to make a 26.4 mL solution and to increase the solution temperature to 16.4 deg Celsius? Assume that there is no heat loss from the solution and that the solution has the same physical ...
Sunday, November 16, 2008 at 3:43am by Anonymous

Chemistry
2.00 M CaCl2 means 2 moles CaCl2/L solution. 1 L of solution has a mass of 1.17 g/mL x 1000 mL = 1170 grams. How much of that is water? 1170 - grams of CaCl2. Convert grams of water to moles. Then moles fraction CaCl2 = moles CaCl2/total moles.
Monday, March 1, 2010 at 1:03pm by DrBob222

chemistry URGENT (1)
What mass (in grams) of CaCl2(s) must be dissolved in pure water at 10.0 deg Celsius to make a 26.4 mL solution and to increase the solution temperature to 16.4 deg Celsius? Assume that there is no heat loss from the solution and that the solution has the same physical ...
Sunday, November 16, 2008 at 2:18pm by Anonymous

Chemistry
How many grams of CaCl2 are needed to make 100ml of a 15% solution in water if only the dihydrated (CaCl2 2H20) salt is available?
Friday, May 17, 2013 at 4:32pm by student123

chemistry
Molarity=moles/volume (L)=0.015= x moles/7.25 L Solve for moles, 0.015*7.25L= moles of CaCl2 in solution moles of CaCl2 in solution*(110.98 g/mol)= mass of CaCl2 in g.
Friday, March 15, 2013 at 1:30pm by Devron

chemistry
A solution is prepared by dissolving 23.7 g of CaCl2 in 375 g of water. The density of the resulting solution? is 1.05 g/ml. the concentration of CaCl2 is ________% by mass. answer: 5.94 can someone tell me the steps?
Wednesday, September 15, 2010 at 5:39pm by john

Chemistry
158.5 mL of a AgNO3 solution at 5.0M was combined with a 3.5M CaCl2 solution. 110.5g of AgCl was recovered. Given that the CaCl2 is the limiting reagent, how many milliliters of the 3.5M CaCl2 solution was used?
Tuesday, April 5, 2011 at 6:39am by Sara

chem
158.5 mL of a AgNO3 solution at 5.0M was combined with a 3.5M CaCl2 solution. 110.5g of AgCl was recovered. Given that the CaCl2 is the limiting reagent, how many milliliters of the 3.5M CaCl2 solution was used? 2 sig figs
Monday, November 29, 2010 at 12:29pm by Michelle

chemistry URGENT (1)
(26.4mL)(1.00g/mL) = 26.4g H2O To raise the temperature of 26.4 g H2O by (16.4 C- 10.0 C), we need: (4.18 J/g.C)(26.4 g)(6.4 C) = 706 J needed - 82.8 kJ.mol-1 CaCl2 is equivalent to: 82800 J / 111g CaCl2 = 746 J/g CaCl2 released. Use the values: 706 J needed and 746 J/g CaCl2 ...
Sunday, November 16, 2008 at 2:18pm by GK

chemistry
15 g CaCl2/molar mass = mols CaCl2. mols/L = molarity. millimolarity is 1000 times that. % W/V is mass in 100 mL solution.
Friday, February 1, 2008 at 10:00pm by DrBob222

Shawn
How many milliliters of 0.355 M NaF solution are needed to react completely with 24.6 mL of 0.216 M CaCl2 solution? How many grams of CaF2 will be formed? The reaction is CaCl2(aq) + 2NaF(aq) → CaF2(s) + 2NaCl(aq)
Friday, July 8, 2011 at 3:06pm by Chemistry

science
Q4.you will be asked to prepare 25.0 mL of a 0.019 M solution of sodium chloride during this experiment.... a.calculate mass of sodium chloride needed to prepare solution. (0.25L)(0.019M NaCl/L)*(58.5g NaCl/1mole NaCl)=0.278 g NaCl....is that right? someone just replied it was...
Thursday, September 17, 2009 at 6:08pm by Ally

chemisty lab
determine the amounts of solute and solvent needed to prepare the following solutions. 2.0 M aqueous NaCl solution 1.0 m aqueous KCl solution 25% by mass aqueous MgCl2 solution
Monday, February 7, 2011 at 11:57am by shaknocka

chemistry
determine the amounts of solute and solvent needed to prepare the following solutions. 2.0 M aqueous NaCl solution 1.0 m aqueous KCl solution 25% by mass aqueous MgCl2 solution
Tuesday, February 8, 2011 at 9:39am by shaknocka lewis

Chemistry
What mass of KOH is necessary to prepare 799.2 mL of a solution having a pH = 11.65?
Wednesday, November 23, 2011 at 7:10pm by Kaleen

chemistry
what is the mass of CuS04 needed to prepare a 125ml solution of 3.5M?
Monday, March 7, 2011 at 12:35pm by kjkajkjujo

Chemistry
1. What is the percent by mass of a solution that contains 50 grams of solute dissolved in 200 grams of solution? What is the concentration of the same solution in parts per million? 2. What is the percent mass of a solution that contains 75 grams of salt dissolved in 150 ...
Friday, March 25, 2011 at 11:03am by Leora

Chemistry
Don't we need to know how much solution we are to prepare? I'll assume we are to use 1 kg water. 1.00 m CaCl2 = 110.983 g CaCl2/kg water. What's the density of the solution. I will assume 1.00 g/mL which probably is not a valid assumption. 81,300 J = 1,000g x 4.184 J/C*g x (...
Monday, April 18, 2011 at 4:20pm by DrBob222

Chemistry
What mass of KH2PO4 is needed to prepare 500.0 mL of a 0.067M solution?
Thursday, February 9, 2012 at 7:34pm by John

chemistry
calculate the mass of naso4 needed to prepare of 0.5L of 0.15M of solution
Wednesday, November 14, 2012 at 5:04am by elissa

Chemistry
I can GUESS that the 23.6 is GRAMS and not mols. I can also GUESS that the next to last sentence should read "when 1 mol calcium chloride dissolves in water?" If my guesses are correct, then q = heat evolved on solution = Cp x delta T. q = 1258 J/oC x delta T for 23.6 g CaCl2...
Thursday, November 1, 2007 at 11:52am by DrBob222

Chemistry
32% CaCl2 means 32 g CaCl2/100 g soln or 32 g CaCl2 in 68 g water. The moles CaCl2 then is 32g/molar mass CaCl2 molality = moles CaCl2/0.068 kg. delta T = i*Kf*m i = 3. solve for delta T and convert to freezing point.
Tuesday, September 14, 2010 at 6:58pm by DrBob222

principles of chenistry
What mass of calcuim chloride is needed to prepare 3.650L of 1.75 M solution?
Saturday, October 16, 2010 at 10:45pm by 0karla

chemistry
What is the mass of naoh needed to prepare a 0.365m solution dissolved in 1525ml of water
Saturday, May 19, 2012 at 11:02am by warren

science-chem
first, thanks so much Bob for helping me!!!! Q4.you will be asked to prepare 25.0 mL of a 0.019 M solution of sodium chloride during this experiment.... a.calculate mass of sodium chloride needed to prepare solution. (0.25L)(0.019M NaCl/L)*(58.5g NaCl/1mole NaCl)=0.278 g NaCl...
Thursday, September 17, 2009 at 5:24pm by Ally

chemistry
You need 0.500 x 0.1 = 0.05 moles CaCl2 or 0.05 moles x molar mass CaCl2 = ?? grams CaCl2. Convert ?? g CaCl2 to CaCl2.H2O.
Sunday, September 5, 2010 at 10:54pm by DrBob222

chemistry
Calcium chloride, CaCl2, has been used to melt ice from roadways. Given that a solution is 25% CaCl2 by mass, estimate the freezing point.
Monday, December 20, 2010 at 9:33am by Akkam

chemistry
calculate the mass of sodium hydroxide needed to prepare 500 mL of a 0.10 M solution.
Sunday, October 14, 2007 at 9:43pm by Rebecca

college chemistry
given 3.650 l of a 1.75 M solution, what mass of calcium chloride is needed to prepare?
Wednesday, September 22, 2010 at 12:10pm by Anonymous

chemistry
calculate the mass of sodium hydroxide needed to prepare 100 ml of a .10 m solution
Sunday, October 7, 2012 at 6:03pm by mike

chemistry
calculate the mass of sodium hydroxide needed to prepare 100 ml of a .10 m solution
Sunday, October 7, 2012 at 6:29pm by mike

chem
2AgNO3 + CaCl2 ==> 2AgCl + Ca(NO3)2 mole AgCl = 110.5/molar mass = ?? moles CaCl2 used = moles AgCl x (1 mole CaCl2/2 moles AgCl) = ?? M CaCl2 = moles CaCl2/L CaCl2. Solve for L CaCl2 and convert to mL. All of this depends, of course, upon the reaction being complete and ...
Monday, November 29, 2010 at 12:29pm by DrBob222

chemistry
how would you prepare 300 ml of a 10% CaCl2 solution (w/w)?
Tuesday, November 29, 2011 at 12:34pm by erin

biotech
how would you prepare 300 ml of a 10% CaCl2 solution (w/w)?
Tuesday, November 29, 2011 at 12:33pm by erin

Chemistry
14-pH=pOH=14-10.5=3.5 pOH=-log[OH-]=3.5 10^-(pOH)=10^-(3.5)=OH concentration in M 4.40L*(OH concentration in M)= moles of OH moles of OH*(39.997 g/mol)= mass of NaOH needed mass of NaOH needed Since 15% is 0.15g of NaOH/g of solution, solving for g of solution mass of NaOH ...
Sunday, March 17, 2013 at 1:58pm by Devron

Chemistry
a chemist wants to make 5.5L of a .3M Cacl2 solution. What mass of CaCl2 should the chemist use?
Sunday, February 9, 2014 at 4:35pm by Charessa

Chemistry
A chemist wants to make 4.5 L of a 0.310 M CaCl2 solution what mass of CaCl2 (in g) should the chemist use
Monday, November 1, 2010 at 7:40pm by Lisa

chemistry
A chemist wants to make 5.5 L of a 0.250 M CaCl2 solution, what mass of CaCl2 (in g) should the chemist use?
Saturday, November 20, 2010 at 1:07pm by Lisa

chemistry
Calculate the mass of silver nitrate needed to prepare a solution of concentration 0.01 moles per litre
Monday, April 4, 2011 at 10:45pm by Anonymous

chemistry
34.9 degrees Celsius. 1) convert CaCl2 to moles then multiply it by 82.8kj/mol to find the heat of CaCl2. 2) Use the q=mct equation. Make sure the mass is the TOTAL MASS (of water + CaCl2) 3) Solve. hope this helps! :)
Friday, October 3, 2008 at 11:23pm by sukiyumi

Chemistry
Calculate mass of silver nitrate needed to prepare a solution of concentration 0.01 moles per liter.
Tuesday, April 5, 2011 at 6:59pm by Slim Shady

chemistry
Determine the mass of NaCl present needed to prepare 500mL of 4.0%m/v solution. Please show me how to set up problem
Thursday, June 16, 2011 at 12:37pm by Angela

Chem
How many moles do you need? That is M x L = mols. Then mol CaCl2 = grams CaCl2/molar mass CaCl2.
Thursday, July 26, 2012 at 9:52am by DrBob222

chemistry
Calculate the mass of sodium hydroxide needed to prepare 500 mL of a 0.10 M solution. I'm pretty sure the answer is 2 grams, but how do I get to that?
Sunday, October 14, 2007 at 9:18pm by Rebecca

chemistry
Calculate the mass of sodium hydroxide needed to prepare 500 mL of a 0.10 M solution. I'm pretty sure the answer is 2 grams, but how do I get to that?
Sunday, October 14, 2007 at 9:19pm by Rebecca

chemistry
What mass of water (in grams) is needed to dissolve 28.7 g of ammonium nitrate NH4NO3 in order to prepare a 0.452 m (molal) solution?
Wednesday, September 8, 2010 at 1:34am by Diana

Chem!!
Consider the dissolution of CaCl2: CaCl2(s) -----------> Ca2+(aq) + 2Cl-(aq) ΔH=-81.5 kJ/mol An 11.0 gram sample of CaCl2 is dissolved in 125 g water with both substances at 25.0 C. Calculate the final temperature of the solution assuming the solution has no heat loss...
Wednesday, November 2, 2011 at 9:05pm by Bob

Chemistry
CaCl2 is the limiting reagent. 1 mole of CaCl2 =2 moles of AgNO3=2 moles of AgCl =1 mole of Ca(NO3)2. 1.50g of CaCl2/110.98 g/mol of CaCl2= number of moles of CaCl2 number of moles of CaCl2*(2 moles of AgCl/1 mole of CaCl2) * 143.32 g of AgCl*mole-1= mass of silver chloride. ...
Wednesday, January 23, 2013 at 5:23pm by Devron

chemistry
I assume the ppt, if done properly, is CaC2O4. Percent CaCl2*2H2O = (mass CaCl2*2H2O/mass sample)*100 = (mass CaCl2*2H2O/0.972 g)*100 = see below. The ppt is CaC2O4. Convert 0.375 g CaC2O4 to moles CaC2O4, then convert to moles CaCl2*2H2O, then to grams CaCl2*2H2O. Plug that ...
Friday, February 19, 2010 at 1:42pm by DrBob222

chemistry
This is a basic stoichiometry problem. 1. Write and balance the equation. 2AgNO3 + CaCl2 ==> 2AgCl + Ca(NO3)2 2. Convert what you have, in this case 45 g CaCl2, to moles. moles = grams/molar mass = 45/molar mass CaCl2 = ?? moles CaCl2 3. Using the coefficients in the ...
Thursday, May 13, 2010 at 7:32pm by DrBob222

Chemistry 101 Electrolytes
grams/molar mass = moles CaCl2. 1 mole CaCl2 contains 6.02 x 10^23 molecules CaCl2. There are a total of 3 moles of ions per 1 mole CaCl2. Go from there.
Monday, June 1, 2009 at 5:22pm by DrBob222

chemistry
how do you calculate the molaarity of a water solution of CaCl2, given that 5.04 L of the solution contains 612 g of CaCl2.
Sunday, June 13, 2010 at 6:40pm by denise

Chemistry
A 230.-mL sample of a 0.280 M CaCl2 solution is left on a hot plate overnight; the following morning, the solution is 1.10 M. What volume of water evaporated from the 0.280 M CaCl2 solution?
Friday, June 21, 2013 at 12:26pm by Ashley

chemistry
how wold you prepare 2.00L of 1.00M HCl solution using 6.00 M HCl? i already found the volume of 6.00M HCl needed to be .333L. i am confused about how to actually prepare the solution. do i used a volumetric flask or any other glassware?
Saturday, February 26, 2011 at 5:31pm by lindy

org chm
Not really organic chem! First calculate [OH-] if pH=11.35 then pOH= 14-11.35 = 2.65 if pOH=2.65 then [OH-]=0.002239 mol L^-1 so solution contains 590 x 0.002239 mmole = 1.32 mmole or 0.00132 mole 1 mole of KOH gives 1 mole of OH- in solution molar mass of KOH = 56.1 so mass ...
Wednesday, November 17, 2010 at 10:05am by Dr Russ

Intro to Chemistry
How do you determine the mass of NACL needed to prepare 25.00 ml of a 1.585M NaCl Solution?
Monday, November 19, 2012 at 6:07am by Jenny

Chemistry
First, calcium chloride is CaCl2. Second, 0.500 g is not very much H2O to be using to prepare any kine of solution. Check your problem and your post. You want 1.5 m solution. The definition is m = mols/kg solvent 1.5m=moles/kg. I don't know if that is 0.5 grams or 0.5 kg. You ...
Wednesday, March 24, 2010 at 10:46pm by DrBob222

chemistry
Chalk this one up to your book. I didn't read the question very well; in fact, I had to read it 3-4 times today before I caught why we were having trouble. The book answer is correct. 2.65 g Na2CO3 will make 250 mL of a 0.1M solution of Na2CO3. However, that isn't what the ...
Tuesday, December 14, 2010 at 4:17pm by DrBob222

GEN CHEM
A solution of CaCl2 is prepared by dissolving 1.004 g of the solid in approximately 30 mL of water. How many moles of CaCl2 does this solution contain?
Sunday, March 3, 2013 at 9:04pm by KRIS

chemistry
what is the number of grams needed to prepare a 1.23 M solution of nitric acid if 250.0 mL are needed?
Thursday, May 19, 2011 at 2:23pm by Anonymous

Chemistry
10% (m/m) Sodium Hydroxide solution, NaOH(aq) is used to break down wood fibre to make paper. A) What mass of the solute is needed to make 250mL of 10% (m/m) solution? B) What mass of solvent is needed? C) What is the molar concentration of the solution?
Monday, May 2, 2011 at 9:28am by Saman

chemistry
how many grans of Ca(OH) are needed to prepare 800.0 ml solution of 0.15M concentration? molar mass of Ca(OH) is 74g/mole
Friday, November 26, 2010 at 1:54am by faye

chemistry
Find the mass of urea needed to prepare 51.7 of a solution in water in which the mole fraction of urea is 7.8010−2.
Sunday, January 29, 2012 at 5:58pm by amy

CHEMISTRY..please help..thanks
A laboratory assistant needs to prepare 325 mL of 0.110 M CaCl2 solution. How many grams of calcium chloride will she need?
Tuesday, November 9, 2010 at 9:57pm by Jasmin

Chemistry
A solution is made by dissolving 10.9 g of calcium chloride, CaCl2,in enough water to make exactly 500 mL of solution. What is the concentration (molarity) of CaCl2 in mol/L?
Saturday, July 24, 2010 at 5:04pm by Shelia

Chemistry
If 10.0g of CaCl2 and 10.0g of NaCl are dissolved in 100.0mL of solution, what is the concentration of chloride ions? I found the molar mass of CaCl2 is 111.0g/mol; the molar mass of NaCl is 58.44g/mol. I divided 10g CaCl2/111.0g CaCl2 I divided 10g NaCl/588.44g NaCl and added...
Monday, July 12, 2010 at 9:33am by Casey

CHEMISTRY
1) find the mole of NaBr in from the solution you want to prepare using c=n/v where c is concentration in mol/L, v is the total volume in mL. 2). find the mass in grams using m=nMr where the mole is in step 1. the mass in step 2 is the mass of NaBr needed to be weighed on ...
Thursday, May 9, 2013 at 4:21am by bonjo

Chemistry
Can someone please tell me if I am doing this problem correctly. Thank you! Given: 450 mL (0.450L); 0.250 M KNO Need: Mass of KNO Q) What mass of KNO3 (MW=101) is needed to prepare 450mL of 0.250 M KNO3 in water? A) 0.450 L Solution x 0.250 M KNO/1 L solution x 101g KNO/1 mol ...
Monday, April 1, 2013 at 5:16pm by Kishwa

Pharm Tech
how many milliliters of a 5% stock solution are needed to prepare 250ml of a 2% solution?
Thursday, November 4, 2010 at 10:58pm by Kelsey

Science
How many grams of CaCl2 are required to prepare 2.00 liters of 7.00 M CaCl2?
Tuesday, April 2, 2013 at 11:11pm by Destiny

chemistry
Consider the dissolution of CaCl2. CaCl2(s) Ca2+(aq) + 2 Cl-(aq) ΔH = -81.5 kJ A 13.0 g sample of CaCl2 is dissolved in 134 g of water, with both substances at 25.0C. Calculate the final temperature of the solution assuming no heat lost to the surroundings and assuming ...
Sunday, November 13, 2011 at 2:20pm by william

Chemistry
Consider the dissolution of CaCl2. CaCl2(s) Ca2+(aq) + 2 Cl-(aq) H = -81.5 kJ A 12.4 g sample of CaCl2 is dissolved in 100. g of water, with both substances at 25.0C. Calculate the final temperature of the solution assuming no heat lost to the surroundings and assuming the ...
Sunday, November 13, 2011 at 4:03pm by Bill

Chemistry
Consider the dissolution of CaCl2. CaCl2(s) Ca2+(aq) + 2 Cl-(aq) H = -81.5 kJ A 10.4-g sample of CaCl2 is dissolved in 102 g of water, with both substances at 25.0C. Calculate the final temperature of the solution assuming no heat lost to the surroundings and assuming the ...
Thursday, April 18, 2013 at 11:51pm by Mike

chemistry
how do i do this \? a 4.0mg/dl standard solution is needed. To prepare 100ml of the working standard. How much stock standard of a 1mg/ml (100mg/dl) solution is needed. i dont understand this conceptually / thanks
Thursday, January 21, 2010 at 2:45am by Dan_9

chemistry
Don't let problems like this confuse you. First mols CaCl2 = grams CaCl2/molar mass CaCl2. Then mols Cl^- is twice that.
Saturday, August 4, 2012 at 8:28am by DrBob222

Chemistry
A solution is labeled as ~8M NaOH. How many mL of this solution would be needed to prepare 750mL of a ~0.2M NaOH solution?
Tuesday, October 19, 2010 at 2:29pm by Katie

chemistry
First we get the amount (the mass, specifically) of calcium chloride needed. Mass is related to number of moles. Recall that molarity (M) is just number of moles (n) divided by the volume (V) in liters: M = n/V Therefore, n = MV n = (0.15 M)(0.2 L) n = 0.03 moles Now, to get ...
Thursday, September 26, 2013 at 10:08am by Jai

Math
A pharmacist is to prepare a 50 fluid ounce solution that contains 54% glucose. The pharmacy has a 30% solution and a 90% solution on hand. How many ounces of each solution should be mixed to prepare the desired perscription?
Friday, February 26, 2010 at 4:47pm by Madison

chemistry
Find the mass of urea needed to prepare 51.7 g of a solution in water in which the mole fraction of urea is 7.5910−2. anyone have the same values?
Tuesday, January 31, 2012 at 1:25am by jazz

chemistry
What is the mass of 0.425 moles of CaCl2? The molar mass of CaCl2 is 110.98 g/mol.
Friday, February 19, 2010 at 12:09am by Jessica

chemistry
how do you solve this problem?? how much NaOH (in grams) is needed to prepare 546mL of solution. What is the pOH of the solution?
Sunday, July 4, 2010 at 3:19am by jin

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